Renew it!! Not just because I'm renewing mine, but there has been a growing increase in social media platforms. As wewll as your Facebook's, Skype, Twitter and Google +, we have seen Pinterest, LinkedIn amongst others become very popular.
Assuming that all of the above become a standard feature in the not to distant future on everyone's contact pages, then it will be easier to just have a .tel domain name.
Maybe in the future, I Social Media company may decide to buy it, in the same way that Microsoft bought Skype and Facebook bought Instagram.
We mobile phone technology becoming more and more advanced, .tel will have a home and a future on the internet as opposed to Yellow Pages.